of: Align macro MAX_PHANDLE_ARGS with NR_FWNODE_REFERENCE_ARGS

Macro NR_FWNODE_REFERENCE_ARGS defines the maximal argument count
for firmware node reference, and MAX_PHANDLE_ARGS defines the maximal
argument count for DT node reference, both have the same value now.

To void argument count inconsistency between firmware and DT, simply
align both macros by '#define MAX_PHANDLE_ARGS NR_FWNODE_REFERENCE_ARGS'.

Signed-off-by: Zijun Hu <quic_zijuhu@quicinc.com>
Reviewed-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Acked-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20250225-fix_arg_count-v4-2-13cdc519eb31@quicinc.com
Signed-off-by: Rob Herring (Arm) <robh@kernel.org>

Author: Zijun Hu

include/linux/of.h

@@ -67,7 +67,7 @@ struct device_node {
 #endif
 };
 
-#define MAX_PHANDLE_ARGS 16
+#define MAX_PHANDLE_ARGS NR_FWNODE_REFERENCE_ARGS
 struct of_phandle_args {
 	struct device_node *np;
 	int args_count;